Nor-Lake Walk-In Error Code Ld3: Low Monitor Temp 3 Alarm
Ld3 on a Nor-Lake Split-Pak walk-in with a LogiTemp or KE2 Evap controller means monitor temperature 3 is below its low alarm setpoint for longer than the delay. The manual's Troubleshooting Tables give corrective actions.
Medium: a monitored point is colder than its limit; product in a cooler may be at risk.
- Code
- Ld3
- Maker
- Nor-Lake
- Equipment
- Walk-in coolers & freezers
- Applies to
- LogiTemp / KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems (A1 refrigerants)
What does Nor-Lake error code Ld3 mean?
Ld3 is the Low Mon3 Temp Alarm in the LogiTemp controller's Alarms and Notifications list for Nor-Lake Split-Pak systems. Monitor 3 is the third extra monitoring point. When its reading stays below its low alarm setpoint for longer than the delay, the controller shows Ld3 and LOW MONITOR TEMP3. As with the other monitor codes, the manual gives the meaning and points to the Troubleshooting Tables from page 52, and it does not say where the monitor 3 sensor sits. A cold reading at that point might reflect the room, the product, or the air stream from the evaporator. Because it has no listed causes, this page can only explain what the control checks: a reading compared with a floor value, a timer, and an alarm when the reading stays under the floor.
Affected models and control systems
Ld3 is listed for the LogiTemp and KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems with A1 refrigerants, in the Alarms and Notifications list printed on pages 48-52. The low setpoint and delay belong to monitor 3.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Ld3 or LOW MONITOR TEMP3 on the display
- Monitor 3 reading under its setpoint
- Frosted product or frozen items near the evaporator
Possible causes
Likely causes — what usually sits behind error code Ld3 on this control. A technician confirms which one it is before any part is replaced.
- Monitor temperature 3 below its low alarm setpoint for longer than the delay
- Monitor 3 sensor sitting in the cold air stream from the evaporator
- Evaporator not defrosting properly and running colder
- Low alarm setpoint left too close to the normal operating temperature
Safe checks before calling for service
- Look at the main display to see what the box is doing.
- Look at where product sits relative to the evaporator air stream.
- Do not change settings.
- Check items near the cold air for freezing damage.
- Write down Ld3, the reading and the time, for the technician.
How a technician diagnoses error code Ld3
- Read the alarm and monitor 3 value.
- Locate the monitor 3 sensor and check it with a reference thermometer.
- Check evaporator airflow and defrost.
- Check compressor cycling.
- Check low setpoint and delay.
- Look up the Troubleshooting Tables entry.
- Refrigeration checks involve line voltage and sealed circuits.
- Monitor settings are service-menu parameters.
- Sensor accuracy needs a reference instrument.
How error code Ld3 differs from similar codes
Ld3 is the low alarm for monitor 3, and the pair of Hd3.
Technical reference
- Document
- LogiTemp Electronic Controller System Operations Manual for Split-Pak Refrigeration Systems Containing A1 Refrigerants
- Edition
- 171527 Rev. A, 2025 (Refrigerated Solutions Group)
- Models / control
- LogiTemp / KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems (A1 refrigerants)
- Section
- Alarms & Notifications List, printed pp. 48-52; Troubleshooting Tables from p. 52
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Nor-Lake walk-in cooler & freezer error codes
Does Ld3 mean a failed sensor?
No. A failed sensor shows dt3. Ld3 means a valid reading is low.
Will Ld3 clear itself?
Once the reading rises above the setpoint.
Is Ld3 a refrigerant problem?
The manual does not say so.
Need help with Nor-Lake error code Ld3?
A technician confirms the cause on site and gives you the price in writing before any work starts.